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Old 15th December 2012, 11:27 AM   #741
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Quote:
Originally Posted by Andersonix View Post

Get real.

Everyone knows cardboard beats foam core...
agreed.

anyone whom ever gave any intelligent thought,

(or had too much time on their hands)

knows that a pulsating cube,

is the correct shape for an accurate transducer.

same shape as the room your sitting in.


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Old 15th December 2012, 12:46 PM   #742
xrk971 is offline xrk971  United States
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So 6 voicecoils in parallel pushing on 6 sides of a cube is the best omnipole? They sell transducer coils that mount to any flat surface. Maybe make a 6 sided foam core cube with 6 of these things? How to mount it to a floor wall, etc? Has to come tnrough vertex....
Interesting...
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Old 15th December 2012, 01:37 PM   #743
bcmbob is offline bcmbob  United States
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Actually I"m using floor underlayment remnainents from when the water heater failed (a sad story for another thread ) and one full 4x8 sheet from that episode. 24" will provide a little longer horn so I'll take your advise and size accordingly.
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Old 15th December 2012, 01:57 PM   #744
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I have been watching this thread with great interest. I was wondering how the HiBM65C20F-8 would perform in this enclosure. I plan to buy a couple of the Hi Wave drivers for a line array.
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Old 15th December 2012, 02:03 PM   #745
xrk971 is offline xrk971  United States
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If you made the mini Cornucopya from foam core facers you will have several 10 x 20 inch remnants. What to do with them? I have been meaning to make a little stereo mp3 player unit and plan to use some cheap pc speakers and amplifier but wanted a transmission line to boost the bass output. Based on remnants that I had, I came up with an A-frame shaped enclosure. There are two TL's each 40 in long (or 1 m), which gives a tuning freq of 85 Hz. The TL will be a little odd in that due to how it is folded using triangular divider channels, the cross sectional area contracts, expands, contracts, and expands before exiting at the front facing terminus. There is no real design here with regards to optimizing the TL as it was based purely on whatever I have left over in foam core remnants. However, I will place the driver at the 1/3 distance from the closed end. The speakers I will be using are the $6.99 specials from Microcenter ('Inland' brand http://www.microcenter.com/product/2...tereo_Speakers) which claim to have a 3.6 watts per channel amp and oblong shaped 2 in x 3.5 in fullrange drivers. Here is what I managed to build in 1 hour this morning. Now I need to find some time to dismantle the speakers to strip out drivers and amp. I plan to mount the amp internally so that the whole thing will be self contained. I actually like how the design came out, it looks clean and modern, and because it is triangular, very stiff and needed no bracing. The tilt on the front baffle allows the driver to aim up a little bit which is good for a tabletop speaker. Oh, one more thing.... Now that I know how to record decent sound clips, I plan on recording a test track with original speakers as is from factory at same setting and distance. Then I will record the same with the new design and we will hear if the TL box improves the sound?
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Old 15th December 2012, 03:47 PM   #746
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Quote:
Originally Posted by xrk971 View Post
According to Cal it makes a big difference how much.
Yes, too little and it sounds very boomy. Too much and it might as well not be a horn. I ended up with none in the throats but I made a cup of rockwool for the chamber. Packed quite tight.
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Old 15th December 2012, 03:50 PM   #747
xrk971 is offline xrk971  United States
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Those speakers from Microcenter are really bad once I took them apart. The drivers are cheesy with no real foam surround just pleated self paper from the cone, and the amp is already giving intermittent sound now that I pulled it out, bad pot on vol knob, and the chip is a TEA2035b which only 2.3 w into 4 ohms at 9 v power supply according to spec sheet. So the 3.6 w rating was a lie - what do you expect from bottom of the barrel speakers? I am just so disappointed in these compared to Logitech s120's which are only a few dollars more. I am rethinking what to put in this cabinet now that I like the shape so much.
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Old 15th December 2012, 03:57 PM   #748
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Cal Weldon View Post
Yes, too little and it sounds very boomy. Too much and it might as well not be a horn. I ended up with none in the throats but I made a cup of rockwool for the chamber. Packed quite tight.
Cal,
Did you ever try adding the stuffing into the mouths of the horns?
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Old 15th December 2012, 04:19 PM   #749
Zigis is offline Zigis  Latvia
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Quote:
Originally Posted by xrk971 View Post
The drivers are cheesy with no real foam surround just pleated self paper from the cone
Actually for paper cone this is normal, foam surround is nothing good for sound.
For amp you can use T-amp board, cheapest and good quality is what Arjen sell;
MKLL Tripath TA2024 Fully Finished Tested PCB 2X15WATT | eBay

You need add only pot and 1-2A 12V addapter, switch mode work good enough for this amp.
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Old 15th December 2012, 04:23 PM   #750
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Quote:
Originally Posted by xrk971 View Post
Cal,
Did you ever try adding the stuffing into the mouths of the horns?
No. When the third try in the chamber worked, I left well enough alone.
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